The best thing to do is to drive with a scanner and look at inputs, or at least scan it for codes, sometimes even a bad coolant temp sensor can make the computer think it is in open loop due a false engine temp reading or even a bad tran fluid temp sensor on the inside of the pan, the converter lockup is not commanded unless trans fluid is known to be over 70 degrees farenhiet and coolant temp over 130 degress, if it has a 4l60e, those are some things to look at hoping its nothing pressure related internally to the trans lockup circuit... let me know if you need any diagnostic help, I do this for a living at the dealership I work at...
Last edited by BossGMC; 07-21-2008 at 11:55 PM.
Had a 99 GMC ESCB with LQ4 conversion and Nelson Performance tunning, currently workin on my 82 SCB GMC with carbed LQ4 conversion in progress, Also have a 00 SS Camaro that runs mid 11's all day long with bolt ons, Drag race my 79 malibu that has a 496 BBC runnin 10's on motor, shootin for 9's with the 250 shot of nitrous in its near future. Use my 04 2500 chevy to pull my rig around and drive the fam in our 07 NNBS yukon, Die Hard Chevy Fan Till The Death.
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